Definition of abscise in English:

verb

For example, petals may wilt and abscise more rapidly after pollen deposition on the stigma or pollen tube growth through the style.

The last bract on the spikelet axis has been removed from around the terminal flower, which has an aborted carpel with a two-branched stigma and the filaments of the two stamens, the anthers having abscised.

In several species the flowers never close, as the petals abscise when the flower is still open.